Async wrapper utility

[techanon]

About time I PR this utility. [Summary] A very basic AJAX script setup that fetches the {{body}} content and related scripts/styles from a page request and injects it into the DOM, replacing existing content, based on the given CSS selector.

NOT recommended for use as a drop-in addition even though it is very simple to add. A proper layout structure should be built around this utility.

[Documentation] Options:

• container ~ The CSS selector to inject the page response into.
• compile ~ Whether or not the utility should auto inject the scripts and styles returned by the page response.
• debug ~ Show simple informational output about the page response and utility state to the console.
• ignore ~ Array of URIs for the utility to prevent binding to. Ignored URIs run as standard links. (It is recommended that additional URIs are amended via the push method.)

Events (via $(document).trigger()):

• async_in ~ Fired if the script determines that the link is within the current domain.
• async_out ~ Fired if the script determines that the link is from another domain.
• async_start ~ Fired immediately before the page request is sent.
• async_pre ~ Fired directly before the HTML injection. Is passed the page response object as a parameter.
• async_post ~ Fired directly after the HTML injection. Is passed the page response object as a parameter.
• async_success ~ Fired iff all actions of the utility for a page request have completed successfully.
• async_error ~ Fired iff the page request explicitly returned an unsuccessful response. (RESTful error returned)
• async_fail ~ Fired iff the page request failed entirely.
• async_end ~ Fired after all other possible events and actions have been completed.

Special Behaviour:

• excluded noasync class ~ If you want to exclude a specific anchor from being binded to by this utitily, add the special noasync class.
• foreign links ~ The utility will automatically open any binded links clicked on that are not of the current domain in a new tab/window (target="_blank").
• cancelling a request ~ You can cancel a page request by setting async.load = false; during the async_start event or cancel the DOM injection by setting async.load = false; during the async_pre event.

[techanon]

Two things concern me:

First, the returned content. Should the entire page object be returned or do you think it should be filtered? Are there any missing values that should be returned which currently aren't?

Secondly, does the cookie need to be set client-side? I wasn't sure so I added it just in case.

[jbroadway]

Finally taking some time to get back on track. Merging this one now :)